20436

Appears in sequences

• Normalized extreme values for "3x+1" trees of depth n.at n=14A045474
• Expansion of (Product_{j>=1} (1-(-x)^j) - 1)^13 in powers of x.at n=16A047638
• Numbers n such that phi(n) = phi(n-1) - phi(n-2).at n=13A066231
• Expansion of (1+x^3*C^3)*C^2, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.at n=9A071735
• Sum of the prime factors of k equals half the sum of the prime factors of k + 1.at n=14A074213
• Sum of largest parts of all partitions of n into odd parts.at n=41A092322
• a(n) = 121*n^2 - n.at n=12A157960
• a(n) = 169*n^2 - 13.at n=10A158550
• Numbers n such that n^16+1 and (n+2)^16+1 are both prime.at n=27A217991
• Number n such that a2 - n^3 is a triangular number (A000217), where a2 is the least square above n^3.at n=36A233400
• Partial sums of A255283.at n=47A255428